Question

我正在尝试对表单进行自定义验证。但是，clean_方法不起作用（无论我尝试什么）。这就是我目前所拥有的 -

from django.forms import ModelForm
from django import forms

class UserProfile(models.Model):
    user = models.ForeignKey(User, unique=True)
    avatar = models.ImageField(upload_to='images/%Y/%m/%d', blank=True)

class ProfilePictureForm(ModelForm):
    class Meta:
        model = UserProfile
        fields = ('avatar',)

    def clean_avatar(self):
        try:
            raise  # this is just to see if the clean_ is working
        except:
            raise

并在views -

def getting_started_pic(request):
    if request.method == 'POST':
        profile.avatar = request.FILES['avatar']
        profile.save()
        return render_to_response (...)

为了让clean_avatar方法“工作”，我缺少什么？（目前，好像它不在那里）。谢谢。

Answer 1

我没有在任何地方看到您的ProfilePictureForm的实例？我假设个人资料是你的实例。如果是这种情况，您需要在ModelForm实例上调用is_valid（）以便调用clean_avatar：

def getting_started_pic(request):
  if request.method == 'POST':
    profile.avatar = request.FILES['avatar']
    if profile.is_valid():
        profile.save()
    return render_to_response (...)

Answer 2

通常的模型表单工作流程是::

def some_view(request):
    profile = request.user.profile # or some other way to get user's profile
    if request.method == 'POST':
        form = ProfilePictureForm(request.POST, request.FILES, instance=profile)    
    else:
        form = ProfilePictureForm(instance=profile)
    if form.is_valid():
        form.save()
        # Redirect somewhere
    # Return failed form

对ModelForm进行验证

2 个答案: